20671403 has 4 divisors (see below), whose sum is σ = 21384240. Its totient is φ = 19958568.

The previous prime is 20671397. The next prime is 20671423. The reversal of 20671403 is 30417602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20671403 - 2¹⁰ = 20670379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20671423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356375 + ... + 356432.

It is an arithmetic number, because the mean of its divisors is an integer number (5346060).

Almost surely, 2^20671403 is an apocalyptic number.

20671403 is a deficient number, since it is larger than the sum of its proper divisors (712837).

20671403 is an equidigital number, since it uses as much as digits as its factorization.

20671403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712836.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 20671403 is about 4546.5814630335. The cubic root of 20671403 is about 274.4458394167.

The spelling of 20671403 in words is "twenty million, six hundred seventy-one thousand, four hundred three".